(中南大學 化學化工學院，長沙 410083)
摘 要: 合成一種新型的表面活性劑——N-丁氧基丙基-S-[2-(肟基) 丙基]二硫代氨基甲酸酯(BOPHPDT)，通過紅外光譜、核磁共振氫譜及碳譜對其結(jié)構(gòu)進行確認。采用微浮選、接觸角、動電位、X射線光電子能譜(XPS)對BOPHPDT浮選孔雀石的疏水機理進行研究。結(jié)果表明：BOPHPDT浮選孔雀石的優(yōu)選pH值為5.5~8.0，其吸附于孔雀石表面帶正電的銅活性位，降低孔雀石的動電位，增大其接觸角，增強其表面疏水性。XPS分析進一步表明，BOPHPDT通過其NH—C(=S)—S和C=N—OH官能團與孔雀石表面的銅原子結(jié)合形成Cu—S和Cu—O鍵而化學吸附于孔雀石表面。
關(guān)鍵字: N-丁氧基丙基-S-[2-(肟基) 丙基]二硫代氨基甲酸酯；孔雀石；浮選；疏水機理
（School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:A novel surfactant—N-butoxypropyl-S-[2-(hydroxyimino) propyl] dithiocarbamate ester (BOPHPDT) was synthesized and characterized by FTIR, 1H NMR and 13C NMR. Its hydrophobic mechanism to malachite flotation was investigated by micro-flotation, contact angle, zeta potential, and XPS. The results show that BOPHPDT exhibits excellent flotation performance to malachite at pH 5.5-8.0 and might anchor on the positively charged copper sites of malachite surfaces, rendering a decreased zeta potential, an increased contact angle and an enhanced hydrophobicity of malachite. XPS further elucidates that BOPHPDT chemisorbs on malachite surface by reaction of its NH—C(=S)—S and C=N—OH groups with the surface copper atoms to form Cu—S and Cu—O bonds.
Key words: N-butoxypropyl-S-[2-(hydroxyimino) propyl] dithiocarbamate ester; malachite; flotation; hydrophobic mechanism
